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11001.

Write mechanism of the following reaction : C_(2)H_(5)OH underset(443K) overset(H_(2)SO_(4)) to CH_(2)=CH_(2)+H_(2)O

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SOLUTION :
Discussion
11002.

""_(Z)^(M)A(g) to _(Z-4)^(M-B)B(g) +alpha- particles The radioactive disintegration follows first order kinetics. Starting with 1mol of A in a 1 litre closed flask at 27^(@)C, pressure set up after two half-lives is approximately

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`25` ATM
`12` atm
`37` atm
`40` atm

Answer :C
Discussion
11003.

Which compounds are more basic than

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ANSWER :BCD
Discussion
11004.

Write the name of gas released when Cu added toConc. HNO_(3)

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SOLUTION :`NO_(2)` gas/Nitrogen DIOXIDE
Discussion
11005.

Which of thefollowing equations depict the oxidising nature of H_(2)O_(2)

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`2MnO_(4)^(-)+6H^(+)+5H_(2)O_(2)rarr2Mn^(2+)+8H_(2)O+5O_(2)`
`2Fe^(3+)+2H^(+)+H_(2)O_(2)rarr2Fe^(2+)+_2H_(2)O`
`2I^(-)+2H^(+)+H_(2)O_(2)rarrI_(2)+2H_(2)O_(2)`
`KIO_(4)+H_(2)O_(2)rarrKIO_(3)+H_(2)O+O_(2)`

Answer :C
Discussion
11006.

Which one of the following is not applicable to the phenomenon of absorption-

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`DELTAHGT0`
`DeltaGlt0`
`DELTAHLT0`
`DeltaSlt0`

ANSWER :A
Discussion
11007.

What is wrong withthe following names? Drawthe structures they represent and write their correct names. (i) 1,1 -dimethylhexane (ii) 2 - methyl - 2 - propylhexane (iii) 3 - methyl - 5 - ethylheptane (iv) 4,4 - dimethyl - 3 - ethyl - pentane (v) 3,4,7 - trimethyloctane (vi) 3,3 - diethyl - 2.4.4trimethylpentane

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Solution :Structures and correct names are given below
(i) `UNDERSET(2 - "methylheptane")((CH_(3))_(2)CHCH_(2)CH_(2)CH_(2)CH_(3)`
(ii) `underset(4,4-"dimethyloctane")(CH_(3)CH_(2)CH(CH_(3))_(2)CH_(2)CH_(2)CH_(2)CH_(3)`
(III) `underset(3-"ethyl-5-methylptane")(CH_(3)CH_(2)CH(CH_(3))CH_(2)CH(CH_(2)CH_(3))_(2))`
(iv) `underset(3-"ethyl-2,2dimethylpentane")(CH_(3)C(CH_(3))_(2)CH(CH_(2)CH_(3))_(2))`
(v) `underset(2,5,6-"trimethyloctane")(CH_(3)CH_(2)CH(CH_(3))CH(CH_(3))CH_(2)CH_(2)CH(CH_(3))_(2))`
(vi) `underset(3,3-"diethyl-2,2,4-trimethyloctane")((CH_(3))_(2)CHC(CH_(2)CH_(3))_(2)C(CH_(3))_(3))`
Discussion
11008.

Which of the following aldehyde will respond to cannizzaro's reaction when treated with strong alkali solution :

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Benzaldehyde
Acetaldehyde
Propionaldehyde
All of the above

Answer :A
Discussion
11009.

The specific conductance at 25^(@)C of a saturated solution of AgCl in water is 1.826 xx 10^(-6) "mho cm"^(-1). If Lambda_(AgCl)^(@) is equal to 138.26 mho cm^(2), find out the solubility of AgCl in water in grams per litre.

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SOLUTION :`1.89 XX 10^(-3)` g/L
Discussion
11010.

What do you mena by specific surface area of an adsorbent ?

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Solution :It is the surface area in SQUARE meters per gram of the solid ADSORBENT which MAY be in the form of POWDER or porous mass.
Discussion
11011.

To calculate the amount of work done in Joules during reversible isothermal expansion of an ideal gas, the volume must be expressed in

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any UNIT
`CM^(3)` only
`DM^(3)` only
`m^(3)` only

Answer :A
Discussion
11012.

What will be the volume of CO_(2) at S.T.P., obtained by heating 9.85g of BaCO_(3) (atomic number of Ba=137)

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1.12 LITRE
0.84 litre
2.24 litre
4.06 litre

Solution :`BaCO_(3) to BaO+CO_(2) UARR`
`therefore197g" "BaCO_(3)` on DECOMPOSE gives=22.4litre `CO_(2)`
`therefore1g" "BaCO_(3)` will give`=(22.4)/(197)="litre "CO_(2)`
`=(22.4xx9.85)/(197)=1.12"litre "CO_(2)`
Discussion
11013.

Which halogen has highest ionisation potential

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FLUORINE
Chlorine
Bromine
Iodine

Answer :A
Discussion
11014.

When an acid or alkali is mixed with buffer solution, then pH of buffer solution

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Not changes
Can INCREASE or Decrease
Increases
Decreases

Solution :Because the PH of BUFFER are not CHANGED.
Discussion
11015.

Which one from the following is the Terylene polymer ?

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ANSWER :B
Discussion
11016.

Which of the following is the sweetest sugar?

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Sucrose
Glucose
FRUCTOSE
MALTOSE

SOLUTION : Fructose is the SWEETEST SUGAR.
Discussion
11017.

Write resonance-contributing structures for the intermedicate carbocation (arenonium ion) of (i) Phenol (ii) Nitrobenzene with electrophile CI^(o+) at the a. ortho-, b. para-, and c. meta-positions.

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Solution :i.
Activing group [e.g., (-OH)` group] stabilies all `o`-positons more than `m`-postions, since the most stable `3^(@)C^(o+)` is formed when the incoming ELECTROPHILE `(Cl^(o+))` enters at `o-` and `p`-positon.ltbrlt II.
Deactivatinggroup [eg., `(-NO_(2))` group] destlises all the positons, but does it with `o-` and `p-` positions more than `m`-position, since one resonance-contriburing structure is LEAST stable (DUE to the POSITIVE charges onadjacent `C` and `N`) when incomingelectrophilic `(Cl^(o+))` enters at `o-` and `p`-position. Hence electrophile attacks at `m-` positions.
Discussion
11018.

Two radioactive nuclides A and B have half-lives 50 min and 10 min respectively . A fresh sample contains the nuclides of B to be eight times that of A. How much time should elapse so that the mumber of nuclides of A becomes double of B ?

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30
40
50
100

Solution :
Discussion
11019.

Which of the following electronic configuration is associated with the biggest jump between the second and third ionization energies?

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`1s^(2)2S^(2)2p^(2)`
`1s^(2)2s^(2)2p^(6)3S^(1)`
`1s^(2)2s^(2)2p^(6)3s^(2)`
`1s^(2)2s^(2)2p^(1)`

Answer :C
Discussion
11020.

What is the role of graphite rod in the electrometallurgy in aluminium?

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Solution :In the electrometallurgy of alumina, a fused mixture of alumina, CRYOLITE and flourspar `(CaF_2)` is electrolysed using praphite as anode and graphite LINED iron as cathode. During electrolysis, Al is liberated at the cathode while CO and `CO_2` are liberated at the anode. The relevant equations are as under :
At cathode : `Al^(3)(" melt ") to Al (l)`
At anode : `C(s)+O^(2-) (" melt ") to CO_(2) (g) + 2e^(-)`
`C(s) +2O^(2-) (" melt ") to CO_(2) (g) +4e^(-)`.
Oxygen evolved at the anode burns, the anode meterial (graphite).
If instead of graphite, some other METAL is used as the anode, then `O_2` libetated will OXIDISE the metal of the electrode. Since graphite is much CHEAPER than any metal, therefore, graphite is used as the anode.
Discussion
11021.

Which of the following will have least hindered rotation about C-C bond ?

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Ethane
Ethylene
Acetylene
Hexachloroethane

Answer :A
Discussion
11022.

Which of the followingreactionis givenby onlyprimaryamine ?

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With HONO
With `CHX_(3)` andalcholice POTASH
Withacetylchloride
With `CH_(3)l`

ANSWER :B
Discussion
11023.

The temperature coefficient of a reaction is:

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The RATE CONSTANT at a fixed temperature
The ratio of rate constant at two temperature
The ratio of rate constant at two different temperatures differing by `10^0` preferably `25^0C` and `35^0C`
NONE of these

Answer :C
Discussion
11024.

Which one of the following sets from the biodegradable polymer -

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`H_2N-CH_2-COOH` and `H_2N-(CH_2)_5-COOH`


`CH_2=CH-CN` and `CH_2=CH-CH=CH_2`

ANSWER :A
Discussion
11025.

Which of the following process(es) are used for purification of Bauxite ore?

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HALL’s PROCESS
Serpeck’s process
Baeyer’s process
MOND’s process

Answer :A::B::C
Discussion
11026.

Using valence bond approach, predict the shape and magnetic character of : (i) [Ni(CO)_(4)] (ii) [NiCl_(4)]^(2-) [Atomic number of Ni = 28]

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Solution :(i) `[Ni(CO)_(4)]`.
`Ni(28) : 4S^(2)3d^(8), Ni(0) : 4s^(0) 3d^(10)` , CO is a strong field ligand, THEREFORE, two 4s electrons are PAIRED with 3d electrons. `sp^(3)` hybridisation takes place

It has tetrahedral shape and is diamagnetic in nature.
(ii) `[NiCl_(4)]^(2-),Ni^(2+):4s^(0)3d^(8)`

It is tetrahedral in shape and paramagnetic in nature due to the presence of two unpaired electrons.
Discussion
11027.

Two solutions A and B are separated by a semi -permeable membrane. As a result to osmosis, the level of solution A is found to rise. It implies thar

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solution A is more concentrated than solution B
solution B is more concentrated than solution A
the SOLUTE molecules of A are SMALLER than those of B
the solute molecules of B are smaller than those of A.

Solution :The NET flow of the solvent is from dilute solution to conentrated solution.
Discussion
11028.

Which of the following alkenes undergo ozonolysis to form a mixture of two ketones-

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`CH_3CH=CHCH_3`
`(CH_3)_2CH-CH=CH_2`

`(CH_3)_2C=C(CH_3)_2`

ANSWER :C::D
Discussion
11029.

When a brown compound of Mn (A) ids treated with HCI, it gives a gas (B). The gas (B) taken in excess reacts with NH_(3) to give an explosive compound (C). The compound A, B and Care ................

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`MnO_(2), Cl_(2), NCl_(3)`
`MnO, Cl_(2), NH_(4)CL`
`Mn_(3)O_(4), Cl_(2), NCl_(3)`
`MnO_(2), Cl_(2), NCl_(2)`

SOLUTION :`MnO_(2), Cl_(2), NCl_(3)`
`underset("(A)")(MnO_(2))+ 4HCl to MnCl_(2)+underset("(B)")(Cl_(2)uarr)+ H_(2)O`
`NH_(3)+ 3Cl_(2) to underset("(C)")(NCl_(3))+ 3HCl`
Discussion
11030.

When potassium dichromate is heated to a white heat, it decomposes to give pottassium chromate, chromic oxide and oxygen gas. The number of moles of oxygen gas liberated in the decomposi- tion process are

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SOLUTION :`4K_2Cr_2O_3 OVERSET(671k^@)RARR 4K_4CrO_4 + 2CrO_3 + 3O_2`
Discussion
11031.

Two solids AB and CB_2 are simultaneously heated in a closed vessel to attain equilibrium. AB(s)hArrA(g)+B(g)..(1) CB_2(s)hArrC(s)+2B(g)….(2) K_P for (1) and (2) reaction are 4.8xx10^(-6) and 5.76xx10^(-6).If partial pressure of A at equilibrium is 2xx10^(-x), find x.

Answer»


Solution :`{:(AB(s)HARR,A(g)+,B(g),),(,y,2x+y,K_P=4.8xx10^(-6)),(CB_2(s)hArr,C(s)+,2B(g),),(,,2x+y,K_P=5.76xx10^(-6)):}`
`(2x+y)^2=5.76xx10^(-6)`
`(2x+u)=2.4xx10^(-3)`
`IMPLIES " " 2.4xx10^(-3)xxy=4.8xx10^(-6)`
`y=2xx10^(-3)`
Discussion
11032.

What is the cause of a feeling of depression in human beings ? Name a drug which can be useful in treating this depression .

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SOLUTION :Low LEVEL of noradrenaline is RESPONSIBLE for the feeling of DEPRESSION in human beings. An important ANTIDEPRESSANT drug is ipronizid.
Discussion
11033.

Which of the followingstatementis not correctaboutorder of areaction ?

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The order of a reaction can be a fractional number.
Order of a reaction is experimaentally determined quantity
The order or a reaction is always equal to the sum of the stoichiometic coefficients of reactants in the BALANCED chemical EQUAITON for a reaction.
The order of a reaction is the sum of the powers of molar CONCENTRATION of the reactants in the rate LAW expression.

Answer :C
Discussion
11034.

Which of these methods can be used to prepare alcohols (I) Hydrolysis of cyanides (II) Hydration of olefines (III) Reduction of carbonyl compounds

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I, II , and III
I and II
II and III
I and III

Solution :
Discussion
11035.

Using Arrhenius equation explain why the rate of a reaction increases with the decrease in activation energy?

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Solution :(i) By Arrhenius equation, the rate CONSTANT k of a reaction at temperature T is represented as `k = P xx Z xx e^(-E_(a)//RT)` where A is a frequency factor, R is a gas constant and Ea is the activation ENERGY.
(ii) As the temperature increases, the ratio `E_(a)//RT` DECREASES, but due to negative sign `(-E_(a)//RT)`, the value increases.
(iii) As the activation energy `E_(a)` decreases, the energy barrier decreases, and more reactant molecules can cross the activation energy barrier. The collision frequency of successful COLLISIONS ALSO increases.
(iv) As activation energy decreases the ratio`- E_(a)//RT` increases.Hence the rate constant and the rate of reaction increase with the decrease in activation energy.
Discussion
11036.

When O_(2) is adsorbed on a metallic surface, electron transfer occurs from the metal to O_(2). The true statement(s) regarding this adsorption is (are)

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`O_(2)` is physisorbed
heat is released
occupancey of `pi_(2p)^(**)` of `O_(2)` increased
bond length of `O_(2)` is increased

Solution :When electron transfer occurs from metal to `O_(2),` chemical bond is formed. Hence,It is chemisorption and not physisorption, Hence (a) is not ture. As it chemisorption, heat is released. Hence, (b) is TRUE. When `O_(2)` takes up ONE electron, it becomes `O_(2)^(-).` According to MOLECULAR orbital theory, new electron will enter into `pi_(2PI)^(**).` As a result, bond order decreases. Hence, bond length increases. Hence, (c ) and (d) true.
Discussion
11037.

Which of. the following set of reagents are used for preparing paracetamol from phenol?

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`HNO_(3), H_(2)//Pd, (CH_(3)CO)_(2)O`
`H_(2)SO_(4), H_(2)//Pd, (CH_(3)CO)_(2)O`
`C_(6)H_(5)N_(2)CL, SnCl_(2)//HCl, (CH_(3)CO)_(2)O`
`Br_(2)//H_(2)O, Zn//HCl, (CH_(2)CO)_(2)O`

Answer :A
Discussion
11038.

Which metal is used to make alloy steel for armour plates, safes and helmets?

Answer»

Al
MN
Cr
Pb

Solution :Mn
Discussion
11039.

Which of the following has the highest pH

Answer»

0.1 M NaOH
0.01 M NaOH
0.1 M HCl
`0.1 M CH_(3)COOH`

Solution :Base have HIGHER pH than acids, stronger is the conc. of base STILL higher is the pH.
Discussion
11040.

Which valency in coordination compounds is satisfied by neutral molecules or negative ions ?

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SOLUTION :SECONDARY
Discussion
11041.

Which of the following is not true

Answer»

Some DISINFECTANTS can be used as antiseptics
Sulphadiazine is a synthetic antibacterial
Aspirin is analgesic as WELL as antipyretic
DIAZEPAM is an antihistaminedrug

Solution :Diazepam is TRANQUILLIZER and not an antihistamine.
Discussion
11042.

Which one of the following is known as lunar caustic when in fused state

Answer»

SILVER nitrate
Silver sulphate
Silver chloride
Sodium sulphate

Answer :A
Discussion
11043.

Which of the following is the example of S_(N^(2)) reaction

Answer»

`CH_(3)Br+OH^(-)toCH_(3)OH+Br^(-)`
`CH_(3)underset(Br)underset(|)(C)HCH_(3)+OH^(-)tounderset(OH)underset(|)(CH_(3)CH)CH_(3)+Br^(-)`
`CH_(3)CH_(2)Ohoverset(-H_(2)O)toCH_(2)=CH_(2)`
`CH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)+OH^(-)toCH_(3)-underset(H)underset(|)overset(CH_(3))overset(|)(C)-O-CH_(3)+Br^(-)`

SOLUTION :Only `1^(@)` ALKYL halides, i.e., `CH_(3)Br` undergoes `S_(N^(2))` reaction.
Discussion
11044.

The substances which are not naturally a part of the food and added to improve the quality of food are called ..................

Answer»

SOLUTION :FOOD ADDITIVES
Discussion
11045.

The residueinsolubein KOHobtained in theHinsberg'stest corresponds to

Answer»

`1^(0)` - AMINE
`2^(0)` - amine
`3^(0)` -amine
cannotbe predicated

ANSWER :B
Discussion
11046.

There are nine elements A to I. these are belongs to p-block element other than halogen. If atomic number of B is average of atomic number of A and C and atomic number of E is average of atomic number of D and F and atomic number of H is average of atomic number of G and I. atomic numbers of B, E and H are 7,15 and 83 respectively and atomic numbers of C, I and F are greater than A, G and D respectively. Q. The correct statement is:

Answer»

`+5` oxidation STATE of H is more stable than its +3 oxidation state.
`G^(2+)` is better oxidisng agent than `G^(4+)`
`+3` oxidation state of E is more stable than its +5 oxidation state
Ionisation energy of G is GREATER than that of "Tin".

SOLUTION :`Pb gt Sn` (Tin): `IE_(1)` (true)
Discussion
11047.

What is concentration of ore?

Answer»

Solution :The removal of impurities or gangue such as sands, clays etc. from the ORE is known as ore benefaction or concentration (dressing) of ore.
Before concentration of ore, the ores are graded and crushed to reasonable size. This is known as crushing of ore. When the ore is crushed in to a fine PARTICLES, it is known as pulverisation.
The concentration of ores involves several steps and selection of these steps DEPENDS upon the DIFFERENCES in physical properties of the compound of the metal and gangue PRESENT in ore. The type of the metal, the available facilities and the environmental factors are also taken into consideration.
Discussion
11048.

To which of the following groups does soap belongs

Answer»

Esters
Amines
Salts of ORGANIC HIGHER FATTY acids
Aldehydes

Answer :C
Discussion
11049.

There are nine elements A to I. these are belongs to p-block element other than halogen. If atomic number of B is average of atomic number of A and C and atomic number of E is average of atomic number of D and F and atomic number of H is average of atomic number of G and I. atomic numbers of B, E and H are 7,15 and 83 respectively and atomic numbers of C, I and F are greater than A, G and D respectively. Q. Which of the following statement is incorrect?

Answer»

`B_(2)C_(5)` is ACIDIC in NATURE
`AC_(2)` is acidic in nature
`FC_(3)` is basic in nature
`GC_(2)` is amphoteric in nature

Solution :`FC_(3)(SO_(3))` is acidic in nature.
Discussion
11050.

Which of the compounds with molecular formula C_5H_10 yields acetone on ozonolysis

Answer»

2-methyl-2-butene
3-methyl-1-butene
Cyclopentane
2 methyl-1-butane

Solution :
Discussion